English Author: Site Editor Publish Time: 2026-03-30 Origin: Site
The selection of a CNC grinding machine hinges on precisely matching the three core dimensions of processing objects, precision requirements, and axis configuration to ensure a seamless connection between equipment capabilities and production demands.
Ⅰ. select the appropriate type based on the processing object
The geometric features of different workpieces determine the type of grinding machine to be selected:
Rotary parts (such as shafts, sleeves, gears) : Prioritize the use of CNC cylindrical grinding machines or CNC internal grinding machines . For instance, automotive drive shafts are suitable for external cylindrical grinding, while the inner holes of bearings need to be completed by internal cylindrical grinding machines.
For flat or stepped surface parts , such as mold base plates and guide rail sliders, a CNC surface grinding machine should be selected. Its reciprocating motion can achieve large-area high-flatness processing.
High-precision hole systems and complex cavities : For instance, in the molds of aero engine blades, a CNC coordinate grinding machine must be used, whose micron-level positioning capability can ensure the accuracy of hole spacing.
Complex cutting tools (such as end mills and drill bits) : a five-axis CNC tool grinding machine should be used to achieve the simultaneous grinding of multi-angle relief angles and chip grooves in one clamping.
Ⅱ. Match the equipment grade based on the precision requirements
Processing accuracy directly determines product performance. When selecting a model, it is necessary to strictly follow the standards:
General accuracy (IT6 to IT7) : It can be met by a common CNC grinding machine, with a positioning accuracy of approximately 0.04mm/300mm, suitable for conventional mechanical parts.
High precision (IT5 and above) : A precision CNC grinding machine must be selected, equipped with a closed-loop control system, hydrostatic guide rails and full closed-loop feedback of grating rulers. The positioning accuracy can reach ±0.1μm, and the grinding accuracy of some high-end models is less than 0.5μm.
Post-heat processing of hard materials : such as quenched steel and hard alloys, CBN or diamond grinding wheels should be matched, and it should be confirmed that the equipment has an automatic compensation function for grinding wheel wear to maintain long-term processing stability.
Ⅲ. Determine the processing capacity based on the number of axes and the linkage mode
The number of axes determines the machining degrees of freedom of complex surfaces:
Three-axis (X/Y/Z) : suitable for linear and circular arc grinding of simple contours, such as planes and standard outer circles.
Four-axis (X/Y/Z/A or C) : By adding a rotating axis, indexing processing can be achieved, suitable for cutting tools with helical grooves or end face gear processing.
Five axes and above (X/Y/Z/A/C) : supports continuous trajectory grinding of complex curved surfaces in space, such as impellers and irregular mold cavities, and is an essential configuration for high-end manufacturing. The typical parameters of A five-axis tool grinding machine are as follows: X-axis stroke 260mm, A-axis +360°, and C-axis ±130°.
